FILE - In a July 10, 2002 file photo, historian Edmund S. Morgan poses in the living room of his home in New Haven, Conn. Morgan, a leading scholar of the colonial era who helped reinvigorate the reputations of the founding fathers, probed the country’s racial and religious origins and, in his 80s, wrote a best-selling biography of Benjamin Franklin, died Monday, July 8, 2013 at Yale-New Haven Hospital, where he was being treated for pneumonia, said his wife, Marie. He was 97. (AP Photo/Bob Child, File)

FILE - In a July 10, 2002 file photo, historian Edmund S. Morgan poses in the living room of his home in New Haven, Conn. organ, a leading scholar of the colonial era who helped reinvigorate the reputations of the founding fathers, probed the country’s racial and religious origins and, in his 80s, wrote a best-selling biography of Benjamin Franklin, died Monday, July 8, 2013 at Yale-New Haven Hospital, where he was being treated for pneumonia, said his wife, Marie. He was 97. (AP Photo/Bob Child, File)

A combination photo shows (from left to right) an avatar posted beside Edward Snowden's biography, him wearing a hoodie, and putting a clothespin on his chest for fellow employees when he worked as a webmaster and editor for a Japanese anime company run by friends in Maryland in 2002. REUTERS/as posted to katiebair.com by an online user in 2002, via Reuters

A combination photo shows (from left to right) an avatar posted beside Edward Snowden's biography, him wearing a hoodie, and putting a clothespin on his chest for fellow employees when he worked as a webmaster and editor for a Japanese anime company run by friends in Maryland in 2002. REUTERS/as posted to katiebair.com by an online user in 2002, via Reuters

A combination photo shows (from left to right) an avatar posted beside Edward Snowden's biography, him wearing a hoodie, and putting a clothespin on his chest for fellow employees when he worked as a webmaster and editor for a Japanese anime company run by friends in Maryland in 2002. REUTERS/as posted to katiebair.com by an online user in 2002, via Reuters

A combination photo shows (from left to right) an avatar posted beside Edward Snowden's biography, him wearing a hoodie, and putting a clothespin on his chest for fellow employees when he worked as a webmaster and editor for a Japanese anime company run by friends in Maryland in 2002. REUTERS/as posted to katiebair.com by an online user in 2002, via Reuters

A combination photo shows (from left to right) an avatar posted beside Edward Snowden's biography, him wearing a hoodie, and putting a clothespin on his chest for fellow employees when he worked as a webmaster and editor for a Japanese anime company run by friends in Maryland in 2002. REUTERS/as posted to katiebair.com by an online user in 2002, via Reuters

A combination photo shows (from left to right) an avatar posted beside Edward Snowden's biography, him wearing a hoodie, and putting a clothespin on his chest for fellow employees when he worked as a webmaster and editor for a Japanese anime company run by friends in Maryland in 2002. REUTERS/as posted to katiebair.com by an online user in 2002, via Reuters

A combination photo shows (from left to right) an avatar posted beside Edward Snowden's biography, him wearing a hoodie, and putting a clothespin on his chest for fellow employees when he worked as a webmaster and editor for a Japanese anime company run by friends in Maryland in 2002. REUTERS/as posted to katiebair.com by an online user in 2002, via Reuters

A combination photo shows (from left to right) an avatar posted beside Edward Snowden's biography, him wearing a hoodie, and putting a clothespin on his chest for fellow employees when he worked as a webmaster and editor for a Japanese anime company run by friends in Maryland in 2002. REUTERS/as posted to katiebair.com by an online user in 2002, via Reuters

In this undated publicity image provided by Simon & Schuster, Siddhartha Mukherjee, author of The Emperor of All Maladies: A Biography of Cancer, is shown. Mukherjee and documentary filmmaker Ken Burns are collaborating on a film based on the book. (AP Photo/Simon & Schuster, Deborah Feingold)

FILE - This July 21, 2012 file photo shows filmmaker Ken Burns posing in Beverly Hills, Calif. Burns and Pulitzer Prize-winning author Siddartha Mukherjee are collaborating for a film based on Mukherjee's book "The Emperor of All Maladies: A Biography of Cancer." (Photo by Matt Sayles/Invision/AP, File)

This book cover image released by Crown shows "The Black Count: Glory, Revolution, Betrayal, and the Real Count of Monte Cristo," by Tom Reiss. Reiss won a Pulitzer Prize in the biography category on Monday, April 15, 2013. (AP Photo/Crown)

This image released by Crown shows Tom Reiss, author of "The Black Count: Glory, Revolution, Betrayal, and the Real Count of Monte Cristo." Reiss won a Pulitzer Prize in the biography category on Monday, April 15, 2013. (AP Photo/Crown)

A supporter of Venezuela's late President Hugo Chavez holds a framed biography of Chavez while waiting for a chance to view his body lying in state, at the military academy in Caracas March 8, 2013. REUTERS/Tomas Bravo

A supporter of Venezuela's late President Hugo Chavez holds a framed biography of Chavez while waiting for a chance to view his body lying in state, at the military academy in Caracas March 8, 2013. REUTERS/Tomas Bravo

A supporter of Venezuela's late President Hugo Chavez holds a framed biography of Chavez while waiting for a chance to view his body lying in state, at the military academy in Caracas March 8, 2013. REUTERS/Tomas Bravo

A supporter of Venezuela's late President Hugo Chavez holds a framed biography of Chavez while waiting for a chance to view his body lying in state, at the military academy in Caracas March 8, 2013. REUTERS/Tomas Bravo

FILE - In this Aug. 20, 2008 file photo, author and biographer Robert Allan Caro smiles during an interview in New York. Caro's fourth Lyndon Johnson book, "The Passage of Power," won the National Books Critics Circle biography prize Thursday, Feb. 28, 2013. It's the third time he has been honored by the critics circle. (AP Photo/Bebeto Matthews, file)